PSI in tires

[dse]

Just got my new tires and it states on the sides the cold psi of 90#. I'm sure I shouldn't put this much in because when I tow they are going to heat up, but how much should I put in? They are 4.80~12 6 ply. Thanks

Doug

 

[jimmbo]

Re: PSI in tires

90 pounds. If you don't put that much in they are going to heat up even more and most likely fail, or smoke, catch fire then fail.

 

[roscoe]

Re: PSI in tires

Cold psi of 90.
Run as close to that as you can.
Notice it says cold psi.
Doesn't matter how hot it is outside, or that they will/may heat up when in use.

As jimmbo says, running underinflated tires will cause more heat and imminent failure.

 

[Texasmark]

Re: PSI in tires

Something isn't right, seems to me. 90 psig on a 6 ply tire? Never heard of such a thing. 90 lbs is more like requirements for a 10 ply tire. I know that they make all sorts of things now-a-days, but I'd thing the appropriate pressure would be more like 45-50 range.

I had a trailer once with 12" tires on it and it was in that range. I remember because my regular auto gauge stopped at 50 and the scale protruded all the way out.

But what do I know?

Mark

 

[burroak]

Re: PSI in tires

Just got my new tires and it states on the sides the cold psi of 90#. I'm sure I shouldn't put this much in because when I tow they are going to heat up, but how much should I put in? They are 4.80~12 6 ply. Thanks

Doug

Doug,

If the tire has 90# cold psi molded into the sidewall of the tire, you can bet that is what it should be. That tire manufacturer paid someone good money to make a mold with that info on it. With product liability being what it is today, the manufacturer has it right. Check with your tire source for reassurance, if you must.

Be sure to have a spare.

 

[Bondo]

Re: PSI in tires

Ayuh,.......

The PSI stated On the Tire, is the pressure the tire Needs to run the Coolest,+ Last the Longest........

 

[Pony]

Re: PSI in tires

Ayuh,.......

The PSI stated On the Tire, is the pressure the tire Needs to run the Coolest,+ Last the Longest........

DITTO!

 

[Texasmark]

Re: PSI in tires

I agree with what you are saying and abide by it personally, but doesn't 90# on a 6 ply seem a bit much? Have you ever seen one?

What brand are these tires?

Tain't a biggie, just curious about it.

Mark

 

[Bondo]

Re: PSI in tires

I see 1 ply Bicycle tires that require 70psi........... That's kinda Insane.......

Much more so than a 6 ply Trailer tire at 90psi..........

 

[Texasmark]

Re: PSI in tires

Just makes you wonder at what pressure the threads will rupture. I know it depends, but every time I air up a tire I think what would happen if it exploded. My face and private parts are usually exposed so it doesn't set well.

Mark

 

[Silvertip]

Re: PSI in tires

Airing up 8 and 12-inch trailer tires off the trailer scares the be-jeepers out of me so I put two bolts through the bolt holes during the process. Those small rims are generally two halves welded together (with questionable precision) and have been known to blow apart. I know that because I saw it happen and one half of the rim was left stuck in the ceiling of the shop as a reminder of what can happen. Anyone that has ever had a split-rim truck rim come apart during the inflation process also has a lot of respect for airing up tires. Fortunately those rims are disappearing but there have been many deaths, broken arms, fingers, and legs due to them. The tires are now inflated in a cage which captures the flying pieces should it come apart.

 

[tommays]

Re: PSI in tires

I see 1 ply Bicycle tires that require 70psi........... That's kinda Insane.......

180 PSI You get a good feel for every grain of sand in the road


Tommays

 

[kenmyfam]

Re: PSI in tires

Whatever is on the tire is what you should use for best operation. My father found that out to his cost when he had 40psi in 2 tires that stated 60psi many years ago. He could not believe that you could put that much air in those tires and they would perform properly. Since that fateful day when he blew 3 out of 4 tires on a 100 mile trip he then used what was stated on the tire and never had another issue. Lucky for me I witnessed the whole thing and learned from it. 90 psi does sound high but they would not put it on there if it needed to be lower.
Good luck.

 

[burroak]

Re: PSI in tires

I see 1 ply Bicycle tires that require 70psi........... That's kinda Insane.......

180 PSI You get a good feel for every grain of sand in the road


Tommays

The tire pressure is formulaic. The load divided by the foot print of the tire in sq. in. equals PSI. Put a 200 lb'er on a bike with those skinny tires; the psi has to be pretty high. For road bikes, I think the tires are constructed to take the higher psi to facilitate the skinner profile, wind resistance, friction, etc.; but road racers change tires more often that you change your underwear.... uh, maybe not.

 

[dse]

Re: PSI in tires

Hey guys, thanks for the info. The tire brand is Deestone (I know they are an off brand, probably made who knows where!!) On the sides they say 6 P.R. Load Range C Max load 990# @ 90psi cold.
That's why I wanted to ask here about the psi, just seemed like alot! But that's what I put in and it rode fine. I thought it might REALLY bounce around if I hit a bump on the road with the tires being that hard, but it didn't.

Thanks again, Doug

P.S. I always have a spare with me.

 

[Gary H NC]

Re: PSI in tires

Just makes you wonder at what pressure the threads will rupture. I know it depends, but every time I air up a tire I think what would happen if it exploded. My face and private parts are usually exposed so it doesn't set well.

Mark

Airing tires while your private parts are exposed! LMAO!! What exactly are you using for the air hose?

Couldn't resist that one Mark....

 

[Texasmark]

Re: PSI in tires

Gary buddy, I understand your candor. Grin

You know what I mean, you crotch down with the tire in front of you, bent over it, or if on the trailer, same thing only 90 degrees displaced.

Glad your boating transition is going smoothly. We have been following your progress.

On split rim tires, when I was a kid in high school, working at the local gas station for 50 cents an hour, I had to fix flats on those 10.00-20 split rims and the whole process was a nightmare, including the air up and potential for the disastrous results mentioned.

Mark

 

[Rancherlee]

Re: PSI in tires

90psi seems like alot to me, I just put the next size bigger 6 ply 13" trailer tires on my boat trailer and they state 50psi cold MAX. I've never seen a smaller trailer tire that suggest 90psi!

 

[RubberFrog]

Re: PSI in tires

...you crotch down with the tire in front of you, bent over it....

Just what's going on over there?